code: def test_empty_str_concat_lit() -> None:
      df = pl.DataFrame(
          {"a": [], "b": []},
          schema=[("a", pl.String), ("b", pl.String)],
      )
      assert df.with_columns(pl.lit("asd") + pl.col("a")).schema == {
          "a": pl.String,
          "b": pl.String,
          "literal": pl.String,
      }
  
file_path: polars/py-polars/tests/unit/test_empty.py
imports: import pytest
  import polars
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 1 for calling a global function with example usage: test_empty_str_concat_lit() without return types